在这里，我必须从图库或相机中选择一个图像。当用户从图库中选择图像时，该选定图像应显示给下一个活动。但是这里这两个活动都在同一个标签下，比如标签A.标签A中的意思有两个活动。在第一个活动中，用户有两个选项可以从图库或相机中选择图像。在同一标签A下的第二个活动中，用户获取所选图像。但在这里，我没有得到预期的输出。以下是我的代码......
public class MainActivity extends TabActivity {
TabHost tabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Resources ressources = getResources();
tabHost = getTabHost();
Intent intentProfile = new Intent().setClass(this, Tab1.class);
TabSpec tabProfile = tabHost
.newTabSpec("Profile")
.setIndicator("Profile", ressources.getDrawable(R.drawable.ic_launcher))
.setContent(intentProfile);
Intent intentFriends = new Intent().setClass(this, Tab2.class);
TabSpec tabFriends = tabHost
.newTabSpec("Friends")
.setIndicator("Friends", ressources.getDrawable(R.drawable.ic_launcher))
.setContent(intentFriends);
tabHost.addTab(tabProfile);
tabHost.addTab(tabFriends);
tabHost.setCurrentTab(0);
}
public void switchTabBar(int tab) {
tabHost.setCurrentTab(tab);
}
@Override
public void onBackPressed() {
// Called by children
MainActivity.this.finish();
}
}
public class ABCGroup extends ActivityGroup{
public static ABCGroup group;
private ArrayList<View> history;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.history = new ArrayList<View>();
group = this;
View view = getLocalActivityManager().startActivity
("ParentActivity",
new Intent(ABCGroup.this, Tab1.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
replaceView(view);
}
public void replaceView(View v) {
// Adds the old one to history
history.add(v);
// Changes this Groups View to the new View.
setContentView(v);
}
public void back() {
if(history.size() > 0) {
history.remove(history.size()-1);
if(history.size()<=0){
finish();
}else{
setContentView(history.get(history.size()-1));
}
}else {
finish();
}
}
@Override
public void onBackPressed() {
ABCGroup.group.back();
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
if (keyCode == KeyEvent.KEYCODE_BACK){
ABCGroup.group.back();
return true;
}
return super.onKeyDown(keyCode, event);
}
}
public class Tab1 extends ActivityGroup {
Button gallery, camera;
private ArrayList<View> myActivityHistory;
private static final int REQUEST_ID = 1;
private static final int HALF = 2;
private static final int TAKE_PICTURE = 3;
private Uri mUri;
private Bitmap mPhoto;
int i = 0;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab1);
myActivityHistory = new ArrayList<View>();
gallery = (Button)findViewById(R.id.gallery);
camera = (Button)findViewById(R.id.camera);
gallery.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v)
{
Intent intent = new Intent();
intent.setAction(Intent.ACTION_GET_CONTENT);
intent.addCategory(Intent.CATEGORY_OPENABLE);
intent.setType("image/*");
startActivityForResult(intent, REQUEST_ID);
}
});
camera.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent("android.media.action.IMAGE_CAPTURE");
File f = new File(Environment.getExternalStorageDirectory(), "photo.jpg");
i.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(f));
mUri = Uri.fromFile(f);
startActivityForResult(i, TAKE_PICTURE);
}
});
}
public void replaceContentView(String id, Intent newIntent, int flag)
{
View mview = getLocalActivityManager().startActivity(id,newIntent.addFlags(flag)).getDecorView();
ABCGroup.group.replaceView(mview);
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case TAKE_PICTURE:
if (resultCode == Activity.RESULT_OK)
{
getContentResolver().notifyChange(mUri, null);
ContentResolver cr = getContentResolver();
try
{
mPhoto = null;
mPhoto = android.provider.MediaStore.Images.Media.getBitmap(cr, mUri);
Uri selectedImageUri = data.getData();
String selectedImagePath = getPath(selectedImageUri);
}
catch (Exception e)
{
Toast.makeText(this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
break;
case REQUEST_ID :
InputStream stream = null;
if (resultCode == Activity.RESULT_OK) {
try
{
stream = getContentResolver().openInputStream(data.getData());
Bitmap original;
original = null;
original= BitmapFactory.decodeStream(stream);
Uri selectedImageUri = data.getData();
String selectedImagePath = getPath(selectedImageUri);
Intent in = new Intent(Tab1.this, Second.class);
replaceContentView("activity3", in, Intent.FLAG_ACTIVITY_CLEAR_TASK);
}
catch (Exception e)
{
e.printStackTrace();
}
if (stream != null) {
try {
stream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
break;
}
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
Toast.makeText(getBaseContext(), "" + cursor.getString(column_index) , 5000).show();
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
SharedPreferences.Editor editor = preferences.edit();
editor.putString("data", cursor.getString(column_index) );
editor.commit();
return cursor.getString(column_index);
}
}
public class Second extends ActivityGroup {
public static Bitmap bmp;
String path;
ImageView iv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
Button btn = (Button)findViewById(R.id.button1);
iv = (ImageView)findViewById(R.id.imageView1);
SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
path = preferences.getString("data", "");
File imgFile = new File(path);
if(imgFile.exists()){
Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
iv.setImageBitmap(myBitmap);
}
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
ABCGroup.group.back();
}
});
}
@Override
public void onBackPressed() {
// this.getParent().onBackPressed();
Intent intent = new Intent(Second.this, Tab1.class);
Tab1 parentActivity = (Tab1)getParent();
parentActivity.replaceContentView("Profile", new Intent(Second.this, Tab1.class), Intent.FLAG_ACTIVITY_CLEAR_TASK);
}
}